num1, num2, num3 = map(lambda _: int(input()), range(3))


def check_numbers(num1, num2, num3):
    if (num3 > 0 and num1 < 0 and num2 < 0) or \
            (num2 > 0 and num1 < 0 and num3 < 0) or \
            (num1 > 0 and num2 < 0 and num3 < 0) or \
            (num1 > 0 and num2 > 0 and num3 > 0):
        return "positive"
    elif num1 == 0 or num2 == 0 or num3 == 0:
        return "zero"
    elif num1 < 0 or num2 < 0 or num3 < 0:
        return "negative"


print(check_numbers(num1, num2, num3))